{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-74410",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-74410"
  ],
  "published": "2026-08-15T06:04:33Z",
  "summary": "wifi: rtw88: fix OOB read from firmware RX descriptor exceeding DMA buffer",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: rtw88: fix OOB read from firmware RX descriptor exceeding DMA buffer\n\nIn rtw_pci_rx_napi(), new_len is computed as the sum of pkt_len (14-bit\ndescriptor field, max 16383) and pkt_offset (drv_info_sz + shift, both\nfirmware-controlled). The result can exceed RTK_PCI_RX_BUF_SIZE (11478),\ncausing an out-of-bounds read from the pre-allocated DMA buffer when\nskb_put_data copies new_len bytes. The USB transport already validates\nthis (rtw_usb_rx_data_put checks against RTW_USB_MAX_RECVBUF_SZ); the\nPCIe path does not.\n\nAdd a check that new_len does not exceed the DMA buffer size.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H"
    }
  ],
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-74410"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/913bd7d3d3d842b5c1d2b908a0201efa8fc79793"
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    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/45abc14ab3f15da7d689f1a8809c1a01240a94d9"
    },
    {
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      "url": "https://git.kernel.org/stable/c/08193e733e5d4790e6c937af86d78793b02709be"
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    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/6a3c384393d3f0b41669ed5a2e88744aad9d87c8"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/26c183a86ea4dd1f2ff90c6f783649e7f5722a10"
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      "url": "https://git.kernel.org/stable/c/01155ded5d4dad61840a9a3c33ab56778ef1f100"
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      "url": "https://git.kernel.org/stable/c/1554fa522f16ec7c5c342ad33fe734eeb6eb2452"
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    {
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      "url": "https://git.kernel.org/stable/c/6e76e9ed273dfb4b3333a5ebbb94958cc5752ab6"
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    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-17T05:50:24Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 8.1,
      "cvss_v3_severity": "High",
      "scenario": "AV:A - The bug is in rtw_pci_rx_napi() on the rtw88 PCIe WiFi RX path, reached when firmware DMAs received 802.11 frames and raises IMR_ROK; exploitation requires transmitting crafted or maximum-size WiFi frames within radio range, which is an adjacent wireless attack per kernel CVSS guidance.\nAC:L - An adjacent attacker can reliably trigger the bug by sending WiFi traffic that causes firmware to populate RX descriptors with pkt_len (up to 16383) plus pkt_offset (drv_info_sz+shift); sums above RTK_PCI_RX_BUF_SIZE (11478) are possible even with max VHT MPDUs (~11454 bytes), and the PCIe path lacked the USB driver's length validation.\nPR:N - No local account, capabilities, or namespace privileges on the victim are required; any unauthenticated attacker in WiFi range can cause the device to receive frames and invoke the driver RX interrupt/NAPI handler without victim credentials or association to the attacker's network.\nUI:N - Exploitation requires only that the rtw88 PCIe interface is active and receiving frames, which is the default on laptops, desktops, and many embedded systems with WiFi enabled; no additional victim actions such as opening files or mounting filesystems are needed.\nS:U - The vulnerability is confined to kernel memory accessed by the rtw88 host driver during RX processing on the same system; it does not cross a VM, container, or IOMMU security boundary to impact a separate security authority.\nC:H - skb_put_data() copies new_len bytes from a 11478-byte DMA RX skb without bounds checking, performing an out-of-bounds kernel heap read of up to thousands of bytes of adjacent slab memory that may contain pointers, keys, or other sensitive data subsequently embedded in the RX skb.\nI:N - The flaw is an out-of-bounds read via memcpy from the undersized RX buffer into a separately allocated skb; it does not directly overwrite kernel memory or provide an arbitrary write primitive, though leaked data could aid separate exploitation.\nA:H - Reading substantially beyond the mapped 11478-byte RX DMA buffer can access unmapped pages or slab redzones and provoke a kernel fault/oops during interrupt/NAPI processing, and repeated malicious frames can disrupt WiFi RX availability on affected rtw88 PCIe devices."
    }
  }
}